weak fuel pump?????

[xp150]

Could a weak fuel pump cause the motor to run lean at WOT and still run 5600rpm.At lower rpm<br />the spark plugs burn normally. I checked plugs after I came back from lake and they looked too lean but I had just ran down the river a few miles WOT. I crank it in the yard and ran it a few minutes with the muffs on. The next day I took it to the shop to get carbs rebuilt (thought they may be leaning it out)I took a plug out to show them and they looked OK.I left it to get carbs done but after I thought about it I think<br />the fuel pump may be weak and leaning out at WOT.What do you think? Is this possible?Thanks Randy

 

[Backlash]

Re: weak fuel pump?????

Hey xp,<br />A bad fuel pump would cause a loss of power but not what I discribe as a lean condition (a mix of too much air & too little fuel getting to the cylinders). I believe rebuilding the carbs will do the trick.<br />Backlash

 

[xp150]

Re: weak fuel pump?????

Well I guess I'll hold off on ordering a new pump. Thanks for the reply

 

[12Footer]

Re: weak fuel pump?????

Yes. It could be trash in the tank,plugged filter,air leak or obstruction in the fuel line.<br />Loose carbs, vacum leak,or loss of compression..The fuel pump operates off engine compression.